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1
Published 2007
Ministry of Education and Science of the Republic of Lithuania
“...Frascati Manual 2002: Proposed Standard Practice for Surveys on Research and Experimental...”
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2
by Genys, Dainius
Published 2017
Vytautas Magnus University
“... Lithuanian society surveys (18 and older). The results reflect the opinion of Lithuanian population...”
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3
by Žibas, Karolis
Published 2016
Vytautas Magnus University
“... to be very difficult. Data of the vital statistics and of various sample surveys are commonly used...”